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LMH6714 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMH6714 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 15 page Application Section (Continued) WIDE BAND DIGITAL PROGRAMMABLE GAIN AMPLIFIER (LMH6720 ONLY) As shown in Figure 6 and Figure 7 the LMH6720 can be used to construct a digitally controlled programmable gain amplifier. Each amplifier is configured to provide a digitally selectable gain. To provide for accurate gain settings, 1% or better tolerance is recommended on the feedback and gain resistors. The gain provided by each digital code is arbitrary through selection of the feedback and gain resistor values. AMPLITUDE EQUALIZATION Sending signals over coaxial cable greater than 50 meters in length will attenuate high frequency signal components much more than lower frequency components. An equalizer can be made to pre emphasize the higher frequency com- ponents so that the final signal has less distortion. This process can be done at either end of the cable. The circuit in Figure 8 shows a receiver with some additional components in the feedback loop to equalize the incoming signal. The RC networks peak the signal at higher frequencies. This peaking is a piecewise linear approximation of the inverse of the frequency response of the coaxial cable. Figure 9 shows the effect of this equalization on a digital signal that has passed through 150 meters of coaxial cable. Figure 10 shows a Bode plot of the frequency response of the circuit in Figure 8 along with equations needed to design the pole and zero frequencies. Figure 11 shows a network analyzer plot of an LMH6714/6720/6722 with the following component values: R G = 309 Ω R1 = 450 Ω C1 = 470pF R2=91 Ω C2 = 68pF 20056519 FIGURE 6. Wideband Digitally Controlled Programmable Gain Amplifier Channel Switching 20056520 FIGURE 7. PGA Output www.national.com 11 |
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